Best cocktail

I want get a couple spare 318s to put back for later builds. Believe it or not any la engine is getting more difficult to find in my area. And when you do find them people want alot for them. I got lucky last year and found 2 360s really cheap and bought them both. And I have a 360 mag Id like to work on my 318 inventory now.
In my opinion, they are rare enough to not waste them but not so rare that you couldn't find one in a pinch or if you really pursued one.